However, 11 of the local kings would not agree to him being High-King. They
did not want to have to do what a fifteen-year-old told them
to. They started a rebellion (a war against the proper ruler).

Merlin the Wizard helped King
Arthur to rule Britain. He took him to a magical lake. Merlin’s
friend, the ‘Lady of the Lake’ lived there beneath the
water. She gave Arthur a magic sword called ‘Excalibur’.

Excalibur was kept in a
magic scabbard. If you used Excalibur in a fight, you would
always defeat your opponent. If you had the scabbard, you
would always be protected from being hurt yourself.

Arthur led a big army
against the 11 rebel kings. There were many battles, but
Arthur had Excalibur, so he won. The kings agreed that Arthur
should be High-King.